擋風板近年來廣被應用於環境工程上作為防風、防麈設施。但有關擋
風板開孔方式對減風及防麈效果的研究仍然不多，因此尚難有完整明確的
準則供設計與建構之用。本研究以SIMPLE-C 數值方法並採用 Low
Reynolds 紊流模式，模擬在大氣紊流邊界層中開孔豎板的物理模型，了
解豎板設計特性（包含豎板尺寸、開孔密度，即孔透風度及開孔佈等），
對流場結構遮蔽效應及防麈效果的影響。結果以透風度20% 可增加顯著減
風區及延長有效減風區的範圍並且平均減風因子最低、防塵效率最高。在
不同高度中以z/H=0.5、0.75高度減風、防塵效果較佳。不同之槽孔大小
將影響動量傳輸及紊流尺度而以4槽孔集中且較高的動量4槽孔集中且較高
的動量及縱方向較佳的動量傳輸使得減風、防塵效率較12槽孔佳。在擋板
z/H > 0.5位置開以較大透風度(40%)，板後注出流將提供有效氣墊作用，
因此減風範圍及防塵效率均較均勻槽孔分布佳。

Artificial shelters have been broadly applied to wind-reduction
and dust-reduction engineering recently. However, the study
about the effect of the modes of pore construction on the wind-
reduction and dust-reduction is seldom presented. Therefore,
there are no completely definite criteria to apply for
designing shelter. In the present study, the SIMPLE-C numerical
method and Low-Reynolds turbulent model are utilized to
investigate the physical model of a shelter with porosity
immersed in the atmospherical turbulent boundary layer and
futher to understand the effect of the design parameters (slot
size,porosity, and slots distribution etc.) on the flow
structure , shelter effects and dust-reduction efficiency. The
results show that 20 % porosity is optimum porosity and have
best wind-reduction effects and dust-redustion efficiency at
z/H=0.5, 0.75 than other heights. The larger slot size causes
that the bleed folws have larger turbulent scales and best
momentum transport in leewind. It extends the momentum defect
duffusion. The fence of more permeable (40 % porosity) at z/H >
0.5 can offer a caushion in the bleed flow,therefore they have
more larger shelter area than uniform distribution.